linux-kernel - Re: [PATCH v2 0/2] drm/bridge: panel: Check device dependency before managing device link

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Date:   Mon, 27 Nov 2023 17:29:19 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Liu Ying <victor.liu@....com>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-next@...r.kernel.org,
        sfr@...b.auug.org.au, gregkh@...uxfoundation.org,
        rafael@...nel.org, andrzej.hajda@...el.com,
        neil.armstrong@...aro.org, rfoss@...nel.org,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        angelogioacchino.delregno@...labora.com, ulf.hansson@...aro.org
Subject: Re: [PATCH v2 0/2] drm/bridge: panel: Check device dependency before
 managing device link

On Mon, Nov 27, 2023 at 05:03:53PM +0100, Linus Walleij wrote:
> On Mon, Nov 27, 2023 at 6:10 AM Liu Ying <victor.liu@....com> wrote:
> 
> > This series aims to check panel device dependency upon DRM device before
> > managing device link between them.  It fixes eariler patches in v6.7-rc1
> > which tried to manage the link.  Without this series, the link fails to
> > be added for dependent panel devices and hence relevant panel bridges
> > fail to be attached.  A real broken panel is "novatek,nt35510" defined
> > in arch/arm/boot/dts/st/ste-ux500-samsung-skomer.dts as reported by
> > Linus Walleij.
> >
> > Patch 1 exports device_is_dependent() to modules as needed by patch 2.
> > Patch 2 checks device dependency before managing the device link.
> >
> > Note that patch 2 is already in drm-misc/drm-misc-fixes and
> > drm-misc/for-linux-next-fixes.  Patch 1 needs to be reviewed and picked up.
> >
> > v2:
> > * Introduce patch 1 to export device_is_dependent() to modules as needed by
> >   patch 2.
> >
> > Liu Ying (2):
> >   driver core: Export device_is_dependent() to modules
> >   drm/bridge: panel: Check device dependency before managing device link
> 
> I just applied patch 1 directly to the drm-misc-fixes so we don't have to
> revert and then re-apply patches, because that is a bigger evil. (We can't
> rebase these branches...)

Erm, you did wait for GKH or Rafael's ACK to do that, right?

Maxime

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